Hi, in my last tooth black spot just appeared on uper side and gum line from some days..i think it's carries .And I feel air sensitivity in that area.. I feel very sour in teeth when I drink lemon water .. I can't have sour food.. My gums are also become swollen and sensitive sometimes..there is some plaque also in lower teeth..I brush two times and do salt water gargle.. Because of covid I can't visit any clinic now, plz any one would suggest me any toothpaste for carries stop progressing, and is power toothbrush better for teeth problems...